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Two-way communication circuit, two-way communication system, and communication method of two-way communication circuit

Active Publication Date: 2008-06-26
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]According to the present invention, both devices connected to the cable periodically switch the transmission direction and the reception direction by periodically transferring the control signal including switch indication information switching the transmission direction and the reception direction. Therefore, it is possible for both devices to obtain transmission right. In other words, according to the present invention, there is provided a two-way communication circuit, a two-way communication system, and a transmission method of the two-way communication circuit that are capable of improving transmission efficiency.

Problems solved by technology

It has now been discovered that transfer efficiency is not maximized in these systems due to arbitration signal for data transmission, retransmission, idle period between data or the like.
However, it can be seen that full bandwidth is not used at all times and there are some area that is not used for transmission or reception of data because only a part of slot of transmission and reception is used.
On the other hand, when transmission unit is small, influence of bit indicating switching of transmission and reception becomes large, which causes decreasing of transmission efficiency.
As stated above, although continuous transmission or continuous reception is possible, transmission time or reception time per one burst is constant and the same burst time is spent even when an amount of transmission data or reception data is small, which causes wasting of time.
Therefore, it causes a problem that the ratio of bit for switching to the whole transmission data becomes large when the transmission unit is small and transfer efficiency degrades.
However, we have now discovered that the above-described techniques have problems below.
For example, in the technique disclosed in Iinuma, the host controls switching of transmission and reception, and the slave cannot control the switching of transmission and reception.
Further, in the data transfer control device disclosed in Shibata et al., the target cannot obtain the transmission right by itself.
Therefore, this technique is not suitable for the application in which transfer direction is needed to be controlled by both of the host and the target.
Further, in the two-way serial data transfer method disclosed in Imokawa, only the master side transmits the transmission direction control pattern and the slave side cannot obtain the transmission right.

Method used

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  • Two-way communication circuit, two-way communication system, and communication method of two-way communication circuit
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  • Two-way communication circuit, two-way communication system, and communication method of two-way communication circuit

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first embodiment

[0033]The specific embodiment to which the present invention is applied will now be described in detail with reference to the drawings. As stated above, a car navigation and a camera video process unit cooperate with each other to realize one application, for example, a slave (target device) also needs to obtain a transmission right. The summary of the present embodiment will be described by taking an example of a camera data process system. FIG. 1 is a diagram showing the camera data process system. The camera data process system can be realized by transferring data interactively between a camera 101 and a process unit 102. In this case, it is preferable that data transfer bandwidth used to transfer data from the camera 101 to the process unit 102 is wide enough to achieve high transfer efficiency. In the present embodiment, control signals including switch indication information switching a transmission direction and a reception direction are periodically transferred to switch the...

second embodiment

[0068]FIG. 6 is a diagram showing a transmission and reception system 1b according to the second embodiment. In the second embodiment shown in FIG. 6 and a third embodiment shown in FIG. 7, the same reference numerals are given to the same components as in the transmission and reception system according to the first embodiment shown in FIG. 3 and detailed description will be omitted. In the second embodiment, the device B is the device dedicated for the target. When the device B is dedicated for the target, the cycle manager 72 and the timer 75 are not mounted because the device B does not need to manage the timing of transmission and reception by itself. The behavior of the second embodiment is the same to the behavior in the first embodiment except that the procedure for setting the master and the target can be omitted.

third embodiment

[0069]Now, the third embodiment will be described. FIG. 7 is a diagram showing a transmission and reception system 1c according to the third embodiment. In the third embodiment, the data is transmitted only from the device A to the device B. The control signal is transmitted and received interactively. This is effective when the device B only needs to transmit short message, or only the control signal. The input and output of the buffer 31 and 71 are limited to one direction.

[0070]As shown in FIG. 8, the device B does not transmit data and only transmits the control signal. The whole switching process is the same as in the first embodiment except that the data is not transmitted from the device B.

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Abstract

A two-way communication circuit is connected to one end of a cable performing half-duplex communication. The two-way communication circuit includes a controller register storing a control signal including switch indication information switching a transmission direction and a reception direction; a communication controller managing timing depending on the control signal stored in the controller register; and a transmission and reception circuit periodically switching the transmission direction and the reception direction according to an indication by the communication controller depending on the control signal.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a two-way communication circuit, a two-way communication system, and a communication method of the two-way communication circuit that are suitable for IEEE 1394 or HDMI (High Definition Multimedia Interface) or the like for example, which are network and interface technology applied to digital products such as PC, digital appliance, and in-vehicle video device.[0003]2. Description of Related Art[0004]Digitization of video application has recently been accelerated and digitization of transmission path physically transmitting video has also been digitalized. IEEE 1394 and HDMI and the like are employed as digital interface technologies, and Ethernet and the like are employed as a network technology. It has now been discovered that transfer efficiency is not maximized in these systems due to arbitration signal for data transmission, retransmission, idle period between data or the like.[0005...

Claims

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Application Information

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IPC IPC(8): H04L5/16G06F13/00H04N7/173H04N21/238H04N21/61
CPCH04L5/1415H04L5/18H04L5/16
Inventor TAKEUCHI, JUNICHI
Owner RENESAS ELECTRONICS CORP
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